FMJ
FMJ definition by Slang.net - The Slang Dictionary
This page explains what the acronym "FMJ" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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A term used in Call of Duty, a first-person shooter game; refers to a item that can be attached to a weapon in order to enable bullets to penetrate through walls and other surfaces.